add reprovide buffer for better batching

ipfs/provide.go

@@ -103,7 +103,10 @@ func (r *Reprovider) Run(ctx context.Context, interval, timeout time.Duration, b
 
 				announced := make([]cid.Cid, 0, len(cids))
 				keys := make([]multihash.Multihash, 0, len(cids))
-				minAnnouncement := time.Now().Add(-interval)
+				// include a slight buffer for CIDs that are about to expire
+				// so they will be provided as one batch
+				buffer := interval / 10
+				minAnnouncement := time.Now().Add(-interval).Add(buffer)
 				for _, c := range cids {
 					// only provide CIDs that have not been provided within the
 					// last interval